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Selena Gomez hits Sundance looking happy and healthy

(Yahoo!) - Justin Bieber who? While Selena Gomez's off-again ex was making headlines in Colorado and Miami over the weekend, the "Slow Down" singer was the toast of Sundance.Gomez made a quick trip to Park City, Utah, on Monday to attend the premiere of her film, "Rudderless," at the Sundance Film Festival. She generated a lot of positive buzz for her role in the flick and celebrated with co-stars William H. Macy and Billy Crudup following the premiere.Selena, 21, partied at the Grey Goose Blue Door on Main St. and was in great spirits all night as she sipped on cocktails and hung out with her fellow cast members.The bash started around 10 p.m. and kicked off with a performance from Crudup and the "Rudderless" band, who belted out a handful of songs from the film. Gomez was spotted rocking out with a male friend, snapping selfies, and taking video of the performance on her cell phone.

Selena then hopped on the mic, and the crowd went crazy when she performed a song from the film herself. Feeling the good vibes, around midnight she got back up onstage and performed an acoustic version of "Come & Get It."

We're glad to report that the actress/singer looked extremely happy and healthy! Last month, Selena canceled the Australian leg of her tour to "spend some time on myself in order to be the best person I can be."